Hi, thanks for suggestions!
I'll definitely migrate to 4.0 after all this is done, then.
Old prod DC I fear can't suffer losing a node right now (a few nodes
have the disk 70% full), but I can maybe find a third node for the new
DC right away.
BTW the new nodes have got 3× the disk space, but are not so much
different regarding CPU and RAM: does it make any sense giving them a
bit more num_tokens (maybe 20-30 instead of 16) than the rest of the old
DC hosts or "asymmetrical" clusters lead to problems?
No real need to do that anyways, moving from 6 nodes to (eventually) 8
should be enough lessen the load on the disks, and before more space is
needed I will probably have more nodes.
Lapo
On 2021-03-20 16:23, Alex Ott wrote:
I personally maybe would go following way (need to calculate how many
joins/decommissions will be at the end):
* Decommission one node from prod DC
* Form new DC from two new machines and decommissioned one.
* Rebuild DC from existing one, make sure that repair finished, etc.
* Switch traffic
* Remove old DC
* Add nodes from old DC one by one into new DC
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